Solving Proportions

Front

What is a proportion?

Back

A proportion is an equation that states that two ratios are equal.

Front

How do you solve a proportion?

Back

To solve a proportion, cross-multiply the two ratios and then solve for the unknown variable.

Front

What is the formula for scale factor?

Back

Front

What does it mean for two ratios to be proportional?

Back

Two ratios are proportional if they can be expressed as equivalent fractions.

Front

If Bobby drove 110 miles using 5 gallons of gas, how many miles can he drive with 1 gallon?

Back

Bobby can drive 22 miles with 1 gallon of gas.

Front

If a recipe calls for 2 cups of flour for 4 servings, how much flour is needed for 10 servings?

Back

You need 5 cups of flour for 10 servings.

Front

What is the scale factor if a small fry is 2 inches and a large fry is 6 inches?

Back

The scale factor is 3.

Front

How do you determine if two ratios are proportional?

Back

You can determine if two ratios are proportional by cross-multiplying and checking if the products are equal.

Front

What is the relationship between the scale factor and the dimensions of similar figures?

Back

The scale factor is the ratio of the lengths of corresponding sides of similar figures.

Front

If a car travels 240 miles on 8 gallons of gas, what is the car's miles per gallon?

Back

The car's miles per gallon is 30.